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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Can you share your code (properly formatted, and marked as spoiler)? As far as I can see, your current code does not crash but it fails to compile.
Well, that is very stranged. I just looked at my C++ test cases again and that value cannot be generated...
Well, you're suppose to return a lowercase char :P